The woman, who is not from St. Louis, was petting the horse when "it bit the tip of her finger off," Walker says. The health department is waiting on the health records from Saint Louis University Hospital and could not specify the size of chunk bitten off.

Aside from a sudden taste for tourist fingertips, the horse shows no neurological symptoms, and it has a record of vaccinations, Walker says. She has coordinated with the state and local public health department to decide what happens to the horse.

Since January, only fourteen horses have been diagnosed with rabies, and those horses usually live in rural pastures, Walker says.

Walker started a campaign against the carriage horses this summer when she spotted a horse having a heat stroke in July. Now, companies can't offer horse-and-carriage rides when heat index is above 100 degrees.